WO2022202567A1 - Moteur-roue et véhicule de type à selle - Google Patents

Moteur-roue et véhicule de type à selle Download PDF

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Publication number
WO2022202567A1
WO2022202567A1 PCT/JP2022/012049 JP2022012049W WO2022202567A1 WO 2022202567 A1 WO2022202567 A1 WO 2022202567A1 JP 2022012049 W JP2022012049 W JP 2022012049W WO 2022202567 A1 WO2022202567 A1 WO 2022202567A1
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WO
WIPO (PCT)
Prior art keywords
wheel
wheel motor
motor
rotor
vehicle
Prior art date
Application number
PCT/JP2022/012049
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English (en)
Japanese (ja)
Inventor
祐一 日▲高▼
Original Assignee
本田技研工業株式会社
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Filing date
Publication date
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Publication of WO2022202567A1 publication Critical patent/WO2022202567A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/14—Torque-transmitting axles composite or split, e.g. half- axles; Couplings between axle parts or sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/12—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg
    • B62K25/14—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with single arm on each fork leg
    • B62K25/20—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with single arm on each fork leg for rear wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M7/00—Motorcycles characterised by position of motor or engine
    • B62M7/12—Motorcycles characterised by position of motor or engine with the engine beside or within the driven wheel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears

Definitions

  • the present invention relates to an in-wheel motor and a straddle-type vehicle.
  • This application claims priority to Japanese Patent Application No. 2021-049682 filed in Japan on March 24, 2021, the content of which is incorporated herein.
  • Patent Document 1 discloses a motor section having a rotor and a stator, a speed reducer section for reducing the rotation of the rotor, a case having an accommodating section for housing the motor section and the speed reducer section, and a rotor through the speed reducer section.
  • An in-wheel motor is disclosed that includes a wheel through which rotation is transmitted.
  • the left and right drive wheels are configured symmetrically. Therefore, the vehicle body balance in the vehicle width direction can be optimized between the left and right drive wheels without excessively considering the weight balance in the axial direction for each drive wheel.
  • an in-wheel motor is applied to a saddle-type vehicle such as a two-wheeled vehicle or a tricycle with one rear wheel, if the weight balance of the driving wheels is uneven in the axial direction, the balance of the vehicle body in the vehicle width direction will be uneven, resulting in poor running. Performance may be affected.
  • the motor which is a heavy object, may deviate from the center of gravity of the wheel, and the weight balance tends to be biased in the axial direction.
  • the present invention provides an in-wheel motor capable of optimizing the weight balance in the axial direction, and a straddle-type vehicle equipped with the in-wheel motor.
  • An in-wheel motor is an in-wheel motor for a saddle type vehicle (1), comprising an electric motor (20) including a rotor (21) and a stator (24) and a wheel (13). ), an output shaft (32) coupled to the hub (70), and an output shaft (32) coupled to the hub (70). and a speed reducer (40) for reducing the speed of the rotation of and transmitting it to the output shaft (32).
  • the reduction gear and the hub which are heavy items, can be arranged on both sides in the axial direction with the electric motor sandwiched therebetween, it is possible to prevent the heavy items from being unevenly arranged in the axial direction. Therefore, the weight balance in the axial direction of the in-wheel motor can be optimized.
  • the speed reducer (40) is arranged coaxially with the output shaft (32) and arranged axially outside the end surface (21a) of the rotor (21). may be
  • the speed reducer is arranged axially inward of the end surface of the rotor and enters the recess formed in the rotor, the magnetic path of the rotor is narrowed, the efficiency of the electric motor is reduced, and the efficiency reduction of the electric motor is suppressed. Therefore, the rotor can be enlarged. According to the configuration according to the aspect of the present invention, since the speed reducer is arranged axially outside the end surface of the rotor, it is possible to suppress an increase in the size of the rotor. Therefore, a small in-wheel motor can be formed by suppressing an increase in the size of the electric motor.
  • a cylindrical outer shaft (31) for transmitting the rotation of the rotor (21) to the speed reducer (40) is provided, and the output shaft (32) is , may be inserted through the outer shaft (31) to transmit the output of the speed reducer (40) to the hub (70).
  • the output of the electric motor can be transmitted to the hub through the inner side of the outer shaft.
  • the size of the in-wheel motor can be reduced compared to a configuration in which a power transmission path is provided so as to pass through the outside of the rear wheel.
  • the output shaft (32) may have an oil passage (34) therein.
  • lubricating oil can be supplied to the movable parts around the output shaft through the oil passage.
  • a housing (50) that houses the electric motor (20) is provided, and the housing (50) is an outer peripheral portion ( 51a) and fins (56) projecting outward from the outer peripheral portion (51a).
  • the area of the outer surface of the housing can be expanded by the fins, so that the electric motor and the like in the housing can be efficiently cooled through the housing.
  • the electric motor (20) may overlap the width center (C) of the rim (14) of the wheel (13).
  • the weight balance of the in-wheel motor in the axial direction can be further optimized by moving the electric motor, which is a heavy object, closer to the center of the width of the wheel.
  • a straddle-type vehicle includes an in-wheel motor (5) according to any one of aspects (1) to (6) above, and an in-wheel motor (5) provided with the in-wheel motor (5). It comprises a wheel (3) and a swing arm (6) supporting said rear wheel (3), said in-wheel motor (5) housing said electric motor (20) and said speed reducer (40). A housing (50) is detachably attached to the swing arm (6).
  • the in-wheel motor and rear wheels can be separated from the vehicle body by removing the housing from the swing arm. Therefore, maintenance of the rear part of the vehicle can be improved.
  • the aspect of (7) above further includes a vehicle body frame (7) that supports the swing arm (6), and the housing (50) includes the vehicle body frame (7) and the rear body frame (7) as viewed from the rear of the vehicle. It may be arranged inside in the vehicle width direction from the straight line (L) circumscribing the wheel (3).
  • the housing does not touch the ground, so damage to the in-wheel motors can be suppressed when the vehicle overturns.
  • an in-wheel motor capable of optimizing the weight balance in the axial direction, and a straddle-type vehicle equipped with the in-wheel motor.
  • FIG. 1 is a left side view of the saddle-ride type vehicle of the first embodiment;
  • FIG. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1;
  • FIG. 2 is a cross-sectional view taken along line III-III of FIG. 1; It is a sectional view of a rear wheel and an in-wheel motor of a 2nd embodiment.
  • FIG. 1 is a left side view of the straddle-type vehicle of the first embodiment.
  • the motorcycle 1 of the present embodiment is an example of a straddle-type vehicle that is operated while the driver straddles a seat (not shown).
  • a motorcycle 1 includes a front wheel 2 and a rear wheel 3, a front wheel suspension 4 that supports the front wheel 2, an in-wheel motor 5 that drives the rear wheel 3, and a swing arm 6 that supports the in-wheel motor 5.
  • the motorcycle 1 also includes a vehicle body frame 7 that supports the front wheel suspension 4 and the swing arm 6, a battery 8 that is a power source for the in-wheel motor 5, and a PCU (power control unit) 9 that controls the in-wheel motor 5. , provided.
  • the front wheel suspension 4 supports the axle of the front wheel 2.
  • the front wheel suspension device 4 suspends the front wheel 2 with respect to the vehicle body frame 7 so as to be displaceable in the vertical direction.
  • the front wheel suspension system 4 is of a swing arm type.
  • the front wheel 2 is rotatably supported by a front wheel suspension device 4 .
  • the front wheel 2 is linked to a steering wheel via a link mechanism (not shown).
  • the front wheels 2 are steered by operating a steering wheel. That is, in this embodiment, the motorcycle 1 has a so-called hub center steering mechanism.
  • the motorcycle may be a vehicle in which a telescopic fork type front wheel suspension is rotatably supported on the vehicle body frame.
  • FIG. 2 is a cross-sectional view taken along line II-II of FIG.
  • the rear wheel 3 includes a wheel 13 having a rim 14 and a disc 15 and a tire 16 mounted on the rim 14 .
  • the wheel 13 is formed asymmetrically.
  • the wheel 13 is formed so that a hub mounting surface 15a formed in the center of the disc 15 faces one side (left side in this embodiment) in the vehicle width direction.
  • the disk 15 is a so-called inset wheel formed so that the hub mounting surface 15a is located on the other side (right side in this embodiment) of the width center C of the rim 14 in the vehicle width direction.
  • the width center C of the rim 14 is a virtual plane that coincides with the width center of the vehicle.
  • the in-wheel motor 5 is arranged inside the rim 14 of the wheel 13 of the rear wheel 3 .
  • the in-wheel motor 5 is fixed to the swing arm 6 .
  • a wheel 13 is attached to the in-wheel motor 5 from the other side in the vehicle width direction.
  • the in-wheel motor 5 outputs driving force for driving the rear wheels 3 to the other side in the vehicle width direction.
  • the configuration of the in-wheel motor 5 will be described later.
  • the swing arm 6 is supported by the body frame 7 so as to be vertically swingable.
  • the swing arm 6 extends rearward from a connecting portion to the vehicle body frame 7 in a side view.
  • the swing arm 6 crosses the rear wheel 3 in a side view through only one side of the vehicle width direction with respect to the rear wheel 3 .
  • the in-wheel motor 5 is detachably coupled to the rear end of the swing arm 6 .
  • the swing arm 6 constitutes a unit swing type rear suspension together with the in-wheel motor 5 and a rear cushion (not shown) to support the rear wheel 3 .
  • the vehicle body frame 7 has a head pipe 11 that supports the steering wheel at the front end, supports the front wheel suspension 4 at the front lower part, and supports the swing arm 6 at the rear lower part. Also, the body frame 7 holds the battery 8 and the PCU 9 .
  • the battery 8 is arranged behind the front wheel suspension 4 and forward of the swing arm 6 .
  • the battery 8 is arranged on the center of the width of the vehicle so as to be sandwiched between the body frames 7 from the outside in the width direction of the vehicle.
  • the PCU 9 is a control device that includes a PDU (Power Drive Unit) that is a motor driver and an ECU (Electric Control Unit) that controls the PDU.
  • the PCU 9 is arranged below the battery 8 .
  • the PCU 9 is arranged so as to be sandwiched between the vehicle body frames 7 from the outside in the vehicle width direction.
  • the PDU includes an inverter, converts the current supplied from the battery 8 from direct current to alternating current, and then supplies power to the in-wheel motor 5 through the three-phase line 18 .
  • a three-phase line 18 electrically connects the in-wheel motor 5 and the PCU 9 .
  • the three-phase line 18 is arranged so that at least a portion of the three-phase line 18 passes through the vehicle width center side of the swing arm 6 . That is, at least part of the three-phase line 18 is covered with the swing arm 6 when viewed from the side of the vehicle.
  • the in-wheel motor 5 includes an electric motor 20 that generates driving force for driving the rear wheels 3 , a wheel center shaft 30 that transmits the output of the electric motor 20 to the wheels 13 , and a driving force of the electric motor 20 .
  • a reduction gear 40 for reducing rotation a housing 50 containing the electric motor 20 and the reduction gear 40, a bearing 60 mounted on the wheel center shaft 30, and a hub 70 coupled to the wheel 13 and coupled to the wheel center shaft 30. , provided.
  • the direction along the central axis O of the rear wheel 3 will be referred to as the axial direction
  • the direction perpendicular to the central axis O will be referred to as the radial direction
  • the direction of rotation around the central axis O will be referred to as the radial direction. It is called circumferential direction.
  • the axial direction coincides with the vehicle width direction.
  • the one (left side) of the vehicle width direction is defined as a first axial direction
  • the opposite direction (right side) is defined as a second axial direction.
  • the electric motor 20 is an inner rotor type IPM (Interior Permanent Magnet) motor (embedded magnet synchronous motor).
  • the electric motor 20 has a rotor 21 and a stator 24 .
  • the rotor 21 includes a rotor core 22 and permanent magnets (not shown).
  • the rotor core 22 is formed in a cylindrical shape centered on the central axis O. As shown in FIG.
  • the rotor core 22 is formed by laminating a plurality of electromagnetic steel sheets in the axial direction. Note that the rotor core 22 may be formed by pressure-molding soft magnetic powder.
  • a plurality of slots (not shown) are formed through the rotor core 22 in the axial direction.
  • a permanent magnet is housed in each slot.
  • the permanent magnets are radially magnetized and form a plurality of magnetic pole portions on the outer peripheral portion of the rotor core 22 .
  • the plurality of magnetic pole portions are formed such that their magnetization directions are alternately reversed along the circumferential direction.
  • the stator 24 includes a stator core 25 and multiple layers (for example, U-phase, V-phase, and W-phase) coils 26 attached to the stator core 25 .
  • Stator 24 generates a magnetic field when current flows through coil 26 .
  • the stator core 25 is formed in a cylindrical shape centered on the central axis O.
  • the stator core 25 is arranged so as to surround the rotor core 22 while being radially spaced from the rotor core 22 by a predetermined distance.
  • the stator core 25 is formed by laminating a plurality of electromagnetic steel sheets in the axial direction.
  • the stator core 25 may be formed by pressure-molding soft magnetic powder.
  • the stator core 25 is provided with slots in which the coils 26 are inserted so as to line up in the circumferential direction.
  • the coil 26 is a segment coil configured by inserting a plurality of conductor segments formed of flat wire into slots of the stator core 25 and connecting them to each other at portions protruding from the stator core 25 in the axial direction.
  • the coils 26 of each phase are mounted on the stator core 25 by distributed winding.
  • the rotor core 22 and the stator core 25 are formed to have the same size in the axial direction.
  • the rotor core 22 and the stator core 25 are arranged so that their end faces are aligned in the axial direction.
  • the coil 26 protrudes to both axial sides of the rotor core 22 .
  • the electric motor 20 is arranged such that at least a portion thereof is located inside the rim 14 of the wheel 13 .
  • the end surfaces of the rotor core 22 and the stator core 25 in the second axial direction are located inside the rim 14, and the end surfaces of the rotor core 22 and the stator core 25 in the first axial direction are positioned in the vehicle width direction. It is located outside 14.
  • the wheel center shaft 30 has a cylindrical outer shaft 31 with both ends opened, and an inner shaft 32 (output shaft) inserted inside the outer shaft 31 .
  • the outer shaft 31 and the inner shaft 32 are arranged around the central axis O. As shown in FIG.
  • the outer shaft 31 is provided on the input side of the speed reducer 40 .
  • the outer shaft 31 is inserted inside the rotor core 22 .
  • the outer shaft 31 is fixed to the rotor core 22 via a cylindrical collar 33 fitted onto the outer shaft 31 .
  • the outer shaft 31 rotates integrally with the rotor 21 .
  • the outer shaft 31 protrudes axially on both sides of the rotor core 22 .
  • the inner shaft 32 is provided on the output side of the reduction gear 40 .
  • Inner shaft 32 transmits the output of speed reducer 40 to hub 70 .
  • the inner shaft 32 is radially spaced apart from the outer shaft 31 .
  • the inner shaft 32 is rotatable with respect to the outer shaft 31 .
  • the inner shaft 32 protrudes from the outer shaft 31 on both sides in the axial direction.
  • the inner shaft 32 is cylindrical and has a cavity inside.
  • a cavity of the inner shaft 32 serves as a channel 34 (oil channel) through which a coolant, which will be described later, flows.
  • the flow path 34 opens at the end face of the inner shaft 32 in the first axial direction.
  • the inner shaft 32 is formed with a discharge hole (not shown) that opens on the outer peripheral surface and communicates the flow path 34 with the outside of the inner shaft 32 .
  • the discharge hole is formed at a location close to the bearing 60 .
  • the speed reducer 40 reduces the speed of rotation of the outer shaft 31 and transmits it to the inner shaft 32 .
  • the speed reducer 40 is arranged on the opposite side of the wheel 13 to the disk 15 with the rotor 21 interposed therebetween.
  • the entire speed reducer 40 is arranged in a first axial direction with respect to the width center C of the rim 14 .
  • the reduction gear 40 is a planetary gear reduction gear.
  • the speed reducer 40 is arranged coaxially with the wheel center axis 30 .
  • the entire reduction gear 40 is arranged axially outside (to the left of) the end surface 21 a of the rotor 21 on the reduction gear 40 side. In this embodiment, the entire speed reducer 40 is arranged axially outside the electric motor 20 as a whole.
  • the speed reducer 40 includes a sun gear 41, a planetary gear 42, a planetary carrier 43, and a ring gear 44.
  • the sun gear 41 is formed on the outer peripheral surface of the end portion of the outer shaft 31 in the first axial direction.
  • Planetary gear 42 meshes with sun gear 41 .
  • the planetary gear 42 is rotatably supported by the planetary carrier 43 .
  • the planetary carrier 43 is arranged to face the edge of the outer shaft 31 in the first axial direction.
  • the planetary carrier 43 is spline-fitted to the inner shaft 32 and rotates together with the inner shaft 32 .
  • the ring gear 44 is formed in an annular shape coaxial with the sun gear 41 and has internal teeth that mesh with the planetary gear 42 on its inner periphery. Ring gear 44 is fastened to housing 50 .
  • the housing 50 is formed in a cylindrical shape with both ends closed and arranged coaxially with the central axis O.
  • the housing 50 includes a case body 51 that houses the electric motor 20 , a lid 52 that closes the opening of the case body 51 , and an intermediate plate 53 arranged inside the case body 51 and the lid 52 .
  • the case main body 51 is formed in a bottomed cylindrical shape and is open in the first axial direction.
  • the case main body 51 includes a peripheral wall portion 51a that surrounds the stator 24 from the outside in the radial direction along the entire circumference, and a bottom wall portion 51b that protrudes radially inward from the edge of the peripheral wall portion 51a in the second axial direction.
  • the peripheral wall portion 51 a holds the stator core 25 .
  • the peripheral wall portion 51a protrudes from the stator core 25 on both sides in the axial direction. At least part of the peripheral wall portion 51a is arranged inside the rim 14 of the wheel 13 and radially faces the rim 14 over the entire circumference.
  • the bottom wall portion 51b faces the disk 15 of the wheel 13.
  • a shaft hole 51c is formed in the bottom wall portion 51b.
  • the shaft hole 51c axially penetrates the bottom wall portion 51b with the central axis O as the center.
  • the inner shaft 32 is inserted through the shaft hole 51c.
  • the inner shaft 32 protrudes in the second axial direction from the bottom wall portion 51b.
  • An annular oil seal 80 is arranged between the shaft hole 51 c and the inner shaft 32 .
  • the lid body 52 is fastened to the peripheral wall portion 51a of the case body 51.
  • the lid body 52 is in close contact with the opening edge of the case body 51 over the entire circumference.
  • the outer surface of the lid body 52 protrudes axially outward (first direction) step by step from the outer peripheral edge toward the central axis O side.
  • a recess 52a for holding a bearing 60 is formed in the center of the inner surface of the lid 52. As shown in FIG.
  • the intermediate plate 53 is arranged between the electric motor 20 and the speed reducer 40 .
  • the intermediate plate 53 is formed in an annular shape centered on the central axis O. As shown in FIG.
  • the intermediate plate 53 extends radially inward from the outer peripheral portion coupled to the case body 51 .
  • the outer shaft 31 and the inner shaft 32 are inserted inside the intermediate plate 53 .
  • the intermediate plate 53 is formed with an annular protrusion 54 that protrudes toward the lid 52 and extends in the circumferential direction.
  • a ring gear 44 is fastened to the annular protrusion 54 .
  • FIG. 3 is a cross-sectional view taken along line III-III of FIG.
  • a fastening convex portion 55 is formed on the outer peripheral surface of the peripheral wall portion 51a.
  • a plurality of fastening protrusions 55 are formed at intervals in the circumferential direction.
  • a bolt hole 55a is formed through the fastening protrusion 55 in the axial direction.
  • the fastening protrusion 55 is sandwiched from both sides in the axial direction by the swing arm 6 .
  • Through holes 6 a coaxial with the bolt holes 55 a of the fastening projection 55 are formed in the swing arm 6 at locations on both sides of the fastening projection 55 in the axial direction.
  • the fastening protrusion 55 is fastened to the swing arm 6 with a bolt inserted through the bolt hole 55a and the through hole 6a. Thereby, the housing 50 can be attached to and detached from the swing arm 6 .
  • fins 56 are formed on the outer peripheral surface of the peripheral wall portion 51a.
  • the fins 56 protrude radially outward from portions of the peripheral wall portion 51a excluding the fastening protrusions 55 .
  • a plurality of fins 56 are provided at intervals in the radial direction.
  • the fins 56 extend along the circumferential direction.
  • the housing 50 is arranged inside in the vehicle width direction of an imaginary straight line L that circumscribes the body frame 7 and the rear wheel 3 when viewed from the rear of the vehicle.
  • the imaginary straight line L circumscribes the body frame 7 and the rear wheel 3 from the opposite side of the wheel 13 to the disk 15 with respect to the housing 50 in the vehicle width direction.
  • the bearing 60 includes a first bearing 61, a second bearing 62, a third bearing 63 and a fourth bearing 64.
  • a first bearing 61 , a second bearing 62 and a third bearing 63 are interposed between the housing 50 and the wheel center shaft 30 .
  • the first bearing 61, the second bearing 62 and the third bearing 63 are ball bearings.
  • the first bearing 61 is fitted into the shaft hole 51c of the bottom wall portion 51b of the case main body 51 inside the oil seal 80 and is mounted on the outer peripheral surface of the inner shaft 32 . Thereby, the case body 51 rotatably supports the inner shaft 32 .
  • the inner ring 61i of the first bearing 61 abuts on the step on the outer peripheral surface of the inner shaft 32 from the outside.
  • the second bearing 62 is fitted into the recess 52 a of the lid 52 .
  • the second bearing 62 is mounted on the outer peripheral surface of the end portion of the inner shaft 32 in the first direction in the axial direction, on the side opposite to the outer shaft 31 with the planetary carrier 43 of the speed reducer 40 interposed therebetween.
  • the lid body 52 supports the inner shaft 32 rotatably.
  • the third bearing 63 is mounted inside the intermediate plate 53 and mounted on the outer peripheral surface of the outer shaft 31 .
  • the intermediate plate 53 thereby rotatably supports the inner shaft 32 .
  • the fourth bearing 64 is a needle bearing.
  • the fourth bearing 64 is attached to the inner peripheral surface of the end portion of the outer shaft 31 in the second axial direction, and is attached to the outer peripheral surface of the inner shaft 32 .
  • the hub 70 is arranged on the opposite side of the speed reducer 40 with the electric motor 20 interposed therebetween.
  • the entire hub 70 is arranged on the opposite side of the speed reducer 40 with respect to the width center C of the rim 14 .
  • Hub 70 is fixed to inner shaft 32 outside housing 50 .
  • the hub 70 is coupled to the axial end of the inner shaft 32 in the second direction.
  • the hub 70 includes a cylindrical hub shaft portion 71 fitted onto the inner shaft 32 and a flange 72 projecting radially outward from the hub shaft portion 71 .
  • the hub shaft portion 71 is fastened to the inner shaft 32 by a nut 75 that is formed at the end portion of the inner shaft 32 in the second axial direction and screwed onto an internal thread.
  • Flange 72 has a wheel mounting surface 73 that joins hub mounting surface 15 a of disk 15 of wheel 13 .
  • Flange 72 is fastened to disk 15 of wheel 13 .
  • a refrigerant for example, automatic transmission fluid
  • the coolant is circulated inside the housing 50 by an oil pump (not shown).
  • the coolant is pumped up from the inner lower part of the housing 50 by the oil pump and introduced into the flow path 34 of the inner shaft 32 .
  • the coolant introduced into flow path 34 is discharged from a discharge hole formed in inner shaft 32 to cool and lubricate each part in housing 50 .
  • the discharge hole of the inner shaft 32 may be formed at a position facing the inner peripheral surface of the outer shaft 31 .
  • the outer shaft 31 and the collar 33 may be formed with through holes penetrating in the radial direction, and the rotor core 22 may be formed with flow paths communicating with the through holes of the outer shaft 31 and the collar 33 .
  • the coolant can be circulated in the rotor core 22 to cool the rotor 21 .
  • the oil pump may be externally attached to the housing 50 or may be built in the housing 50 . Also, the oil pump may be operated by the output of the electric motor 20 or may be operated by electric power supplied from a system separate from the electric motor 20 .
  • the in-wheel motor 5 of the present embodiment includes the speed reducer 40 arranged on the opposite side of the hub 70 with the electric motor 20 interposed therebetween to reduce the speed of rotation of the rotor 21 and transmit the speed to the inner shaft 32 .
  • the reduction gear 40 and the hub 70 which are heavy objects, can be arranged on both sides in the axial direction with the electric motor 20 interposed therebetween, it is possible to prevent the heavy objects from being unevenly arranged in the axial direction. Therefore, the weight balance in the axial direction of the in-wheel motor 5 can be optimized.
  • the speed reducer 40 is arranged coaxially with the outer shaft 31 and arranged axially outside the end surface 21 a of the rotor 21 . If the speed reducer is arranged axially inward of the end surface of the rotor and enters the recess formed in the rotor, the magnetic path of the rotor is narrowed, the efficiency of the electric motor is reduced, and the efficiency reduction of the electric motor is suppressed. Therefore, the rotor may become large. According to this embodiment, since the speed reducer 40 is arranged axially outside the end surface 21a of the rotor 21, the rotor 21 can be prevented from increasing in size. Therefore, it is possible to suppress an increase in size of the electric motor 20 and form a small in-wheel motor 5 .
  • the in-wheel motor 5 further includes a cylindrical outer shaft 31 that transmits rotation of the rotor 21 to the speed reducer 40 .
  • the inner shaft 32 is inserted through the outer shaft 31 and transmits the output of the speed reducer 40 to the hub 70 .
  • This configuration allows the output of the electric motor 20 to be transmitted to the hub 70 through the inner side of the outer shaft 31 .
  • the in-wheel motor 5 can be made smaller compared to a configuration in which a power transmission path is provided so as to pass through the outside of the rear wheel 3 .
  • the inner shaft 32 has a flow path 34 inside. With this configuration, the coolant can be supplied to the movable portion around the inner shaft 32 through the flow path 34 .
  • a housing 50 that houses the electric motor 20 has a peripheral wall portion 51a that surrounds the stator 24 and fins 56 that protrude outward from the peripheral wall portion 51a. With this configuration, the area of the outer surface of the housing 50 can be increased by the fins 56 , so that the electric motor 20 and the like inside the housing 50 can be efficiently cooled through the housing 50 .
  • the housing 50 is detachably attached to the swing arm 6. According to this configuration, the in-wheel motor 5 and the rear wheel 3 can be separated from the vehicle body by removing the housing 50 from the swing arm 6 . Therefore, maintenance of the rear part of the vehicle can be improved.
  • the housing 50 is arranged inside in the vehicle width direction of an imaginary straight line L that circumscribes the body frame 7 and the rear wheel 3 when viewed from the rear of the vehicle. According to this configuration, even if the vehicle is tilted until the vehicle body frame 7 touches the ground, the housing 50 does not touch the ground. In addition, it is possible to prevent the maximum bank angle of the vehicle from being restricted by the ground contact of the in-wheel motor 5, and improve the turning performance of the vehicle.
  • FIG. 4 is a cross-sectional view of the rear wheel and in-wheel motor of the second embodiment.
  • the second embodiment shown in FIG. 4 differs from the first embodiment in that the in-wheel motor 5 is arranged so that the electric motor 20 overlaps the width center C of the rim 14 of the wheel 13 .
  • the electric motor 20, which is a heavy object is moved to the center of the width of the rear wheel 3, so that the weight balance of the in-wheel motor 5 in the axial direction can be further optimized.
  • the present invention is not limited to the above-described embodiments described with reference to the drawings, and various modifications are conceivable within its technical scope.
  • the present invention is applied to motorcycles, but the scope of application of the present invention is not limited to this.
  • the present invention can be applied to a rear one-wheel motor tricycle. That is, the present invention can be applied to a saddle type vehicle in which drive wheels driven by in-wheel motors are arranged on the vehicle width center of the vehicle.
  • the coils 26 of the stator 24 are distributed by segment coils, but the present invention is not limited to this configuration.
  • the stator coils may be concentrated or distributed winding of copper wire.
  • a so-called IPM motor including a magnet-embedded rotor 21 is taken as an example of the electric motor 20, but the configuration is not limited to this.
  • the electric motor may be a so-called SPM (Surface Permanent Magnet) motor having a rotor with a magnet attached to the outer peripheral surface of the rotor core.
  • the housing 50 of the in-wheel motor 5 is detachable from the swing arm 6, but the configuration is not limited to this. That is, the housing of the in-wheel motor may be integrated with the swing arm.
  • an in-wheel motor capable of optimizing the weight balance in the axial direction, and a straddle-type vehicle equipped with the in-wheel motor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Engineering (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

Ce moteur-roue (5) d'un véhicule de type à selle (1) comprend : un moteur (20) comprenant un rotor (21) et un stator (24); un moyeu (70) couplé à une roue (13); un arbre interne (32) couplé au moyeu (70); et un réducteur (40) qui est disposé sur le côté opposé du moyeu (70) tout en prenant en sandwich le moteur (20), réduit la vitesse de rotation du rotor (21) et transmet la rotation à l'arbre interne (32).
PCT/JP2022/012049 2021-03-24 2022-03-16 Moteur-roue et véhicule de type à selle WO2022202567A1 (fr)

Applications Claiming Priority (2)

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JP2021-049682 2021-03-24
JP2021049682 2021-03-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003002277A (ja) * 2001-06-27 2003-01-08 Yamaha Motor Co Ltd 電動式動力ユニット、電動車両および電動二輪車
JP2009136078A (ja) * 2007-11-29 2009-06-18 Toyota Motor Corp モータ冷却構造
JP2012091689A (ja) * 2010-10-27 2012-05-17 Honda Motor Co Ltd 電動二輪車
JP2015116900A (ja) * 2013-12-18 2015-06-25 Ntn株式会社 車輪用駆動装置
WO2019211947A1 (fr) * 2018-05-03 2019-11-07 本田技研工業株式会社 Véhicule électrique de type à selle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003002277A (ja) * 2001-06-27 2003-01-08 Yamaha Motor Co Ltd 電動式動力ユニット、電動車両および電動二輪車
JP2009136078A (ja) * 2007-11-29 2009-06-18 Toyota Motor Corp モータ冷却構造
JP2012091689A (ja) * 2010-10-27 2012-05-17 Honda Motor Co Ltd 電動二輪車
JP2015116900A (ja) * 2013-12-18 2015-06-25 Ntn株式会社 車輪用駆動装置
WO2019211947A1 (fr) * 2018-05-03 2019-11-07 本田技研工業株式会社 Véhicule électrique de type à selle

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